Edition V18N04 | Year 2013 | Editorial Original Article | Pages 29 to 34
Objective: To assess the adhesive resistance of metallic brackets bonded to temporary crowns made of acrylic resin after different surface treatments.
Methods: 180 specimens were made of Duralay and randomly divided into 6 groups (n = 30) according to surface treatment and bonding material: G1 ? surface roughening with Soflex and bonding with Duralay; G2 ? roughening with aluminum oxide blasting and bonding with Duralay; G3 ? application of monomer and bonding with Duralay; G4 ? roughening with Soflex and bonding with Transbond XT; G5 ? roughening with aluminum oxide blasting and bonding with Transbond XT and G6: application of monomer and bonding with Transbond. The results were statistically assessed by ANOVA/Games-Howell.
Results: The means (MPa) were: G1= 18.04, G2= 22.64, G3= 22.4, G4= 9.71, G5= 11.23, G6= 9.67. The Adhesive Remnant Index (ARI) ranged between 2 and 3 on G1, G2 and G3 whereas in G4, G5 and G6 it ranged from 0 to 1, showing that only the material affects the pattern of adhesive flaw.
Conclusion: The surface treatment and the material influenced adhesive resistance of brackets bonded to temporary crowns. Roughening by aluminum blasting increased bond strength when compared to Soflex, in the group bonded with Duralay. The bond strength of Duralay acrylic resin was superior to that of Transbond XT composite resin.